Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
how slower » has slower, low lower
wang yang » wang yan, wang liang, wang yanling
guang der » gang der, zugang der, klang der
der rent » der re, der rede
jong min » song min, song ming, cog min
gong min » song min, gong meng, song ming
how slow » how low, grow slow, too slow

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang guang der rent ((jong min) OR (gong min)) ((how slow) OR (how slower)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang guang der rent ((jong min) or (gong min)) ((how slow) or (how slower)) ;*.